TY - JOUR AU - Kaloshian, Isgouhi AU - Williamson, Valerie M. AU - Miyao, Eugene M. AU - Lawn, Dennis A. AU - Westerdahl, Becky B. TI - “Resistance-breaking” nematodes identified in California tomatoes JF - California Agriculture JO - Calif Agr Y1 - 1996/11/01 VL - 50 IS - 6 SP - 18 EP - 19 PB - University of California Agriculture and Nature Resources SN - 0008-0845 UR - http://dx.doi.org/10.3733/ca.v050n06p18 L3 - 10.3733/ca.v050n06p18 AB - Resistance to root-knot nematodes in tomato is conferred by the gene Mi. We have identified two field populations of Meloidogyne incognita that parasitize tomato plants containing the Mi gene. This necessitates the use of planned crop rotation practices and the incorporation of other resistance genes into cultivated tomato.